Right-angle handpiece for dental engines



J. F. NELSON.

RIGHT ANGLE HANDPIECE FOR DENTAL ENGINES.

APPLICATION FILED MAR. 2B, 19]!!- Patented Mar. 2 1920.

JOSEPH F. NELSON, OF SCOTT CITY, KANSAS.

RIGHT-ANGLE HILNDPIECE FOR DENTAL ENGINES.

Specification of Letters Patent.

Patented Mar. 2, 1920.

Application filed larch 28 1919. Serial 110. 285,748.

To all whom it may concern:

Be it known that I, Josnrn F. NELSON, a citizen of the United States, residing at Scott City, in the county of Scott and State of Kansas, have invented certain new and useful Improvements in Right-Angle Handpieces for Dental Engines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will. enable others skilled in the art to which it appertains to make and use the same.

This invention relates to right angle handpieces for dental engines, and the primary object of the invention is to provide an improved means for mounting the tool carrying sleeve in the tool support, so as to provide a relatively large area of bearing surface for the same and thus increase the wear of the arts.

Another 0 ject of the invention is to provide animproved means for taking up the wear of the tool carrying sleeve, so as to effectively increase the life thereof.

A further object of the invention is to provide an improved means for holding the bur or other tool in the tool carrying sleeve, whereby the same can be readily removed or placed in position in the handpiece.

A still further object of the invention is to provide an improved right angle handpiece of the above character, which is durable and efiicient in use, one that is simple and easy to manufacture, and one that can be placed upon the market at a reasonable cost.

With these and other objects in view, the invention consists in the novel construction, arrangement and formation of parts, as will be hereinafter more specifically described, claimed and illustrated in the accompanying drawings, forming a part thereof, in which:

Figure 1 is a side elevation of the improved handpiece.

Fig. 2 is a vertical central longitudinal section through the same.

Fig. 3 is an enlarged vertical section through the tool carrying sleeve, showing-a tool positioned therein.

Referring to the drawings in detail, wherein similar reference characters designate corresponding parts throughout the several views, the numeral 1 indicates the handpiece,which supports the shaft 2 in the ordinary manner and carries at the outer end thereof the tool support 3, which has theinternally threaded socket 4 by means of which the tool support is held in position, The tool support alsoincludes the transverse socket 5 in which is removable fitted the tool carrying sleeve 6 having frustoconical enlargements 7 and 8 formed on the terminals thereof, which form enlarged bearing surface for the sleeve. The smaller ends of the frusto-conical portions are disposed in op site relation to each other, and the lower rusto-conical member 8 has the upper surface thereof provided with teeth, so as to form a cogwheel 9, which is adapted to mesh with a cogwheel 10 carried by the outer end of the shaft 2, whereby the sleeve may be readily rotated by the shaft.

The terminals of the transverse sockets 5 are provided with internal screw threads 11, in which are fitted the upper and lower caps 12 and 13. Each of the caps is provided with an annular outstanding knurled flange 14,whereby the same may be readily grasped and unthreaded from the sockets 5 when so desired. The caps 12 and 13 are internally tapered, as at 15, so as to conform to the configuration of the frusto-conical enlargements 7 and- 8 to form bearings for the same. The lower cap 13 is provided with av through the bore of the sleeve and this pin is adapted to engage the flattened portion 18 of the tool when the same is inserted in the sleeve to prevent independent rotation thereof in relation to the sleeve.

The tool carr ing sleeve 6 is provided with an inwardly extending opening 23, which communicates with the bore of the sleeve adjacent to the upper end thereofand slidably receives the locking pin 20, which has the inner end thereof tapered as at 24 and the ta ered end is adapted to fit in the groove 19 ormed in the tool 18 for holding the same in osition in the sleeve.

In operation of the improved device, the' tool carrying sleeve is inserted in the socket 5 and the caps 12 and 13 are threaded into position and the caps support the same for rotary movement in the socket. \Vhen it is desired to insert the tool 17 in the tool carrying sleeve. 6. the upper cap 19. is' partially unscrewed, which permits the locking pin to be forced outwardly from the bore of the sleeve and permits the tool to be readily inserted in the sleeve. The cap 12 is then screwed down tight, and the inclined surface thereof forces the locking pin 20 inwardly, so as to position thetapered end thereof in the groove 19. The rounded or tapered end 24 of the pin permits the tool to readily push the same out of the opening 23, when the cap is unthreaded.

From the foregoing description, it can be seen that an improved right angle handpiece is provided, in which a relatively large bearing surface is provided for the tool carrying sleeve which gives longer wear to the parts and in which an improved and simple means is provided for holding the tool in position in the sleeve.

'hen the bearing surfaces of the tool carrying sleeve have become worn, the terminals of the socket 5 may be filed down so as to permit the caps to be threaded further into the socket and thus take up the wear thereof.

In practice, I have found that the form of my invention illustrated in the accompanying drawings and referred to in the above description, as the preferred embodiment, is

the most efficient andv practical; yet realizing the conditions concurrent with the adoption of my device will necessarily vary, I desire to emphasize that various minor changes in details of construction, proportion and arrangement of parts may be resorted to, when required without sacrificing any of the advantages of my invention as set forth.

What I claim as new is:

. 1. A right angle handpiece for dental engines including an attaching socket, a transverse socket, a tool carrying sleeve fitted in the transverse socket, a tool detachably fitted in said sleeve, means slidably carried by the a sleeve for engaging said tool to hold the same against displacement, and removable caps fitted on the terminals of the transverse socket and arranged to rotatably support the tool carrying sleeve, one of said caps engaging said tool holding means to hold the same in operative position.

2. A right angle handpiece for dental engines comprising an attaching socket, a

transverse socket, a tool carrying sleeve detachably fitted in the transverse socket, a tool detachably fitted in the sleeve, said sleeve having oppositely directed frustoconical enlargements formed on the terminals thereof, said frusto-conical enlargements forming enlarged bearing surfaces, a transversely sliding pin carried by one of said frusto-conical enlargements and arranged to detachably engage the tool to holdthe same against accidental displacement, and removable caps threaded intorthe terminals of the transverse sockets and having tapered interiors to receive the frustoconical enlargements to form bearings for the same, the tapered surface of one of said caps engaging the outer end of said pin to force and hold the same in engagement with the tool, as and for the purpose specified.

3. A right angle handpiece for dental engines including an attaching socket, a transverse socket, a tool carrying sleeve fitted in the transverse socket, a tool detachably fittedin said sleeve, a sliding pin carried by said sleeve and arranged to engage said tool to hold the same against accidental movement in relation to the sleeve, and bearing members removably carried by the terminals of the transverse socket, one of said bearing members being arranged to slidably engage said pin to hold the same in engagement gitih the tool, as and for the purpose speci- 4. A right angle hand piece for dental engines comprising an attaching socket, a transverse socket, atool carrying sleeve fitted in the transverse socket, and having substantially frusto-conical bearing members formed on the terminals thereof, a tool arranged to be detachably fitted in said sleeve, said tool having an annular groove formed therein adjacent to the upper edge thereof, and a sliding pin carriedby the upper frusto-conical member and arranged to engage said groove, and caps threaded into the terminals of said transverse socket and having the interiors thereof tapered to form bearings for the sleeve, said upper cap forming means for holding the pin in engagement with the groove, as and for the purpose specified.

In testimony whereof I aflix my signature in presence of two witnesses.

JOSEPH F. NELSON.

Witnesses:

A F. GOODWINE, C. E. NORMAN. 

